Yes the mushroom compost would be rich and make a good tea.
I suspect that is the worm here, they are big and 6 or 8 inches long, I may have lost them now, but they were here in the past.
I am only 25 miles from Lake Mohave, so there are fish in the area and the little store here in the valley, 30 years ago sold nightcrawlers to the fishermen.